<template>
	<view class="uni-data-tree">
		<view class="uni-data-tree-input" @click="handleInput">
			<slot
				:options="options"
				:data="inputSelected"
				:error="errorMessage"
			>
				<view
					class="input-value"
					:class="{ 'input-value-border': border }"
				>
					<text
						v-if="errorMessage"
						class="selected-area error-text"
						>{{ errorMessage }}</text
					>
					<view
						v-else-if="loading && !isOpened"
						class="selected-area"
					>
						<uni-load-more
							class="load-more"
							:contentText="loadMore"
							status="loading"
						></uni-load-more>
					</view>
					<scroll-view
						v-else-if="inputSelected.length"
						class="selected-area"
						scroll-x="true"
					>
						<view class="selected-list">
							<view
								class="selected-item"
								v-for="(item, index) in inputSelected"
								:key="index"
							>
								<text class="text-color">{{ item.text }}</text
								><text
									v-if="index < inputSelected.length - 1"
									class="input-split-line"
									>{{ split }}</text
								>
							</view>
						</view>
					</scroll-view>
					<text v-else class="selected-area placeholder">{{
						placeholder
					}}</text>
					<view
						v-if="clearIcon && !readonly && inputSelected.length"
						class="icon-clear"
						@click.stop="clear"
					>
						<uni-icons
							type="clear"
							color="#c0c4cc"
							size="24"
						></uni-icons>
					</view>
					<view
						class="arrow-area"
						v-if="
							(!clearIcon || !inputSelected.length) && !readonly
						"
					>
						<view class="input-arrow"></view>
					</view>
				</view>
			</slot>
		</view>
		<view
			class="uni-data-tree-cover"
			v-if="isOpened"
			@click="handleClose"
		></view>
		<view class="uni-data-tree-dialog" v-if="isOpened">
			<view class="uni-popper__arrow"></view>
			<view class="dialog-caption">
				<view class="title-area">
					<text class="dialog-title">{{ popupTitle }}</text>
				</view>
				<view class="dialog-close" @click="handleClose">
					<view class="dialog-close-plus" data-id="close"></view>
					<view
						class="dialog-close-plus dialog-close-rotate"
						data-id="close"
					></view>
				</view>
			</view>
			<data-picker-view
				class="picker-view"
				ref="pickerView"
				v-model="dataValue"
				:localdata="localdata"
				:preload="preload"
				:collection="collection"
				:field="field"
				:orderby="orderby"
				:where="where"
				:step-searh="stepSearh"
				:self-field="selfField"
				:parent-field="parentField"
				:managed-mode="true"
				:map="map"
				:ellipsis="ellipsis"
				@change="onchange"
				@datachange="ondatachange"
				@nodeclick="onnodeclick"
			>
			</data-picker-view>
		</view>
	</view>
</template>

<script>
import dataPicker from '../uni-data-pickerview/uni-data-picker.js'
import DataPickerView from '../uni-data-pickerview/uni-data-pickerview.vue'

/**
 * DataPicker 级联选择
 * @description 支持单列、和多列级联选择。列数没有限制，如果屏幕显示不全，顶部tab区域会左右滚动。
 * @tutorial https://ext.dcloud.net.cn/plugin?id=3796
 * @property {String} popup-title 弹出窗口标题
 * @property {Array} localdata 本地数据，参考
 * @property {Boolean} border = [true|false] 是否有边框
 * @property {Boolean} readonly = [true|false] 是否仅读
 * @property {Boolean} preload = [true|false] 是否预加载数据
 * @value true 开启预加载数据，点击弹出窗口后显示已加载数据
 * @value false 关闭预加载数据，点击弹出窗口后开始加载数据
 * @property {Boolean} step-searh = [true|false] 是否分布查询
 * @value true 启用分布查询，仅查询当前选中节点
 * @value false 关闭分布查询，一次查询出所有数据
 * @property {String|DBFieldString} self-field 分布查询当前字段名称
 * @property {String|DBFieldString} parent-field 分布查询父字段名称
 * @property {String|DBCollectionString} collection 表名
 * @property {String|DBFieldString} field 查询字段，多个字段用 `,` 分割
 * @property {String} orderby 排序字段及正序倒叙设置
 * @property {String|JQLString} where 查询条件
 * @event {Function} popupshow 弹出的选择窗口打开时触发此事件
 * @event {Function} popuphide 弹出的选择窗口关闭时触发此事件
 */
export default {
	name: 'UniDataPicker',
	emits: [
		'popupopened',
		'popupclosed',
		'nodeclick',
		'input',
		'change',
		'update:modelValue',
		'inputclick',
	],
	mixins: [dataPicker],
	components: {
		DataPickerView,
	},
	props: {
		options: {
			type: [Object, Array],
			default() {
				return {}
			},
		},
		popupTitle: {
			type: String,
			default: '请选择',
		},
		placeholder: {
			type: String,
			default: '请选择',
		},
		heightMobile: {
			type: String,
			default: '',
		},
		readonly: {
			type: Boolean,
			default: false,
		},
		clearIcon: {
			type: Boolean,
			default: true,
		},
		border: {
			type: Boolean,
			default: true,
		},
		split: {
			type: String,
			default: '/',
		},
		ellipsis: {
			type: Boolean,
			default: true,
		},
	},
	data() {
		return {
			isOpened: false,
			inputSelected: [],
		}
	},
	created() {
		this.$nextTick(() => {
			this.load()
		})
	},
	watch: {
		localdata: {
			handler() {
				this.load()
			},
			deep: true,
		},
	},
	methods: {
		clear() {
			this._dispatchEvent([])
		},
		onPropsChange() {
			this._treeData = []
			this.selectedIndex = 0

			this.load()
		},
		load() {
			if (this.readonly) {
				this._processReadonly(this.localdata, this.dataValue)
				return
			}

			// 回显本地数据
			if (this.isLocalData) {
				this.loadData()
				this.inputSelected = this.selected.slice(0)
			} else if (this.isCloudDataList || this.isCloudDataTree) {
				// 回显 Cloud 数据
				this.loading = true
				this.getCloudDataValue()
					.then((res) => {
						this.loading = false
						this.inputSelected = res
					})
					.catch((err) => {
						this.loading = false
						this.errorMessage = err
					})
			}
		},
		show() {
			this.isOpened = true
			setTimeout(() => {
				this.$refs.pickerView.updateData({
					treeData: this._treeData,
					selected: this.selected,
					selectedIndex: this.selectedIndex,
				})
			}, 200)
			this.$emit('popupopened')
		},
		hide() {
			this.isOpened = false
			this.$emit('popupclosed')
		},
		handleInput() {
			if (this.readonly) {
				this.$emit('inputclick')
				return
			}
			this.show()
		},
		handleClose(e) {
			this.hide()
		},
		onnodeclick(e) {
			this.$emit('nodeclick', e)
		},
		ondatachange(e) {
			this._treeData = this.$refs.pickerView._treeData
		},
		onchange(e) {
			this.hide()
			this.$nextTick(() => {
				this.inputSelected = e
			})
			this._dispatchEvent(e)
		},
		_processReadonly(dataList, value) {
			var isTree = dataList.findIndex((item) => {
				return item.children
			})
			if (isTree > -1) {
				let inputValue
				if (Array.isArray(value)) {
					inputValue = value[value.length - 1]
					if (typeof inputValue === 'object' && inputValue.value) {
						inputValue = inputValue.value
					}
				} else {
					inputValue = value
				}
				this.inputSelected = this._findNodePath(
					inputValue,
					this.localdata
				)
				return
			}

			if (!this.hasValue) {
				this.inputSelected = []
				return
			}

			let result = []
			for (let i = 0; i < value.length; i++) {
				var val = value[i]
				var item = dataList.find((v) => {
					return v.value == val
				})
				if (item) {
					result.push(item)
				}
			}
			if (result.length) {
				this.inputSelected = result
			}
		},
		_filterForArray(data, valueArray) {
			var result = []
			for (let i = 0; i < valueArray.length; i++) {
				var value = valueArray[i]
				var found = data.find((item) => {
					return item.value == value
				})
				if (found) {
					result.push(found)
				}
			}
			return result
		},
		_dispatchEvent(selected) {
			let item = {}
			if (selected.length) {
				var value = new Array(selected.length)
				for (var i = 0; i < selected.length; i++) {
					value[i] = selected[i].value
				}
				item = selected[selected.length - 1]
			} else {
				item.value = ''
			}
			if (this.formItem) {
				this.formItem.setValue(item.value)
			}

			this.$emit('input', item.value)
			this.$emit('update:modelValue', item.value)
			this.$emit('change', {
				detail: {
					value: selected,
				},
			})
		},
	},
}
</script>

<style>
.uni-data-tree {
	flex: 1;
	position: relative;
	font-size: 14px;
}

.error-text {
	color: #dd524d;
}

.input-value {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	align-items: center;
	flex-wrap: nowrap;
	font-size: 14px;
	/* line-height: 35px; */
	padding: 0 10px;
	padding-right: 5px;
	overflow: hidden;
	height: 35px;
	/* #ifndef APP-NVUE */
	box-sizing: border-box;
	/* #endif */
}

.input-value-border {
	border: 1px solid #e5e5e5;
	border-radius: 5px;
}

.selected-area {
	flex: 1;
	overflow: hidden;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
}

.load-more {
	/* #ifndef APP-NVUE */
	margin-right: auto;
	/* #endif */
	/* #ifdef APP-NVUE */
	width: 40px;
	/* #endif */
}

.selected-list {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	flex-wrap: nowrap;
	/* padding: 0 5px; */
}

.selected-item {
	flex-direction: row;
	/* padding: 0 1px; */
	/* #ifndef APP-NVUE */
	white-space: nowrap;
	/* #endif */
}

.text-color {
	color: #333;
}

.placeholder {
	color: grey;
	font-size: 12px;
}

.input-split-line {
	opacity: 0.5;
}

.arrow-area {
	position: relative;
	width: 20px;
	/* #ifndef APP-NVUE */
	margin-bottom: 5px;
	margin-left: auto;
	display: flex;
	/* #endif */
	justify-content: center;
	transform: rotate(-45deg);
	transform-origin: center;
}

.input-arrow {
	width: 7px;
	height: 7px;
	border-left: 1px solid #999;
	border-bottom: 1px solid #999;
}

.uni-data-tree-cover {
	position: fixed;
	left: 0;
	top: 0;
	right: 0;
	bottom: 0;
	background-color: rgba(0, 0, 0, 0.4);
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: column;
	z-index: 100;
}

.uni-data-tree-dialog {
	position: fixed;
	left: 0;
	/* #ifndef APP-NVUE */
	top: 20%;
	/* #endif */
	/* #ifdef APP-NVUE */
	top: 200px;
	/* #endif */
	right: 0;
	bottom: 0;
	background-color: #ffffff;
	border-top-left-radius: 10px;
	border-top-right-radius: 10px;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: column;
	z-index: 102;
	overflow: hidden;
	/* #ifdef APP-NVUE */
	width: 750rpx;
	/* #endif */
}

.dialog-caption {
	position: relative;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	/* border-bottom: 1px solid #f0f0f0; */
}

.title-area {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	align-items: center;
	/* #ifndef APP-NVUE */
	margin: auto;
	/* #endif */
	padding: 0 10px;
}

.dialog-title {
	/* font-weight: bold; */
	line-height: 44px;
}

.dialog-close {
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	align-items: center;
	padding: 0 15px;
}

.dialog-close-plus {
	width: 16px;
	height: 2px;
	background-color: #666;
	border-radius: 2px;
	transform: rotate(45deg);
}

.dialog-close-rotate {
	position: absolute;
	transform: rotate(-45deg);
}

.picker-view {
	flex: 1;
	overflow: hidden;
}

.icon-clear {
	display: flex;
	align-items: center;
}

/* #ifdef H5 */
@media all and (min-width: 768px) {
	.uni-data-tree-cover {
		background-color: transparent;
	}

	.uni-data-tree-dialog {
		position: absolute;
		top: 55px;
		height: auto;
		min-height: 400px;
		max-height: 50vh;
		background-color: #fff;
		border: 1px solid #ebeef5;
		box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
		border-radius: 4px;
		overflow: unset;
	}

	.dialog-caption {
		display: none;
	}

	.icon-clear {
		/* margin-right: 5px; */
	}
}

/* #endif */

/* picker 弹出层通用的指示小三角, todo：扩展至上下左右方向定位 */
/* #ifndef APP-NVUE */
.uni-popper__arrow,
.uni-popper__arrow::after {
	position: absolute;
	display: block;
	width: 0;
	height: 0;
	border-color: transparent;
	border-style: solid;
	border-width: 6px;
}

.uni-popper__arrow {
	filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
	top: -6px;
	left: 10%;
	margin-right: 3px;
	border-top-width: 0;
	border-bottom-color: #ebeef5;
}

.uni-popper__arrow::after {
	content: ' ';
	top: 1px;
	margin-left: -6px;
	border-top-width: 0;
	border-bottom-color: #fff;
}

/* #endif */
</style>
